s=set([1,1,2,2,3,3])
print(s)
s.add(4)
print(s)
s.remove(4)
print(s)

s1=set([1,2,3])
s2=set([4,2,3])
print(s1 & s2)
print(s1 & s2)

a=['c','b','a']
a.sort()
print(a)

a='abc'
print(a.replace('a','A'))
a = a.replace('a','A')
print(a)

ts = zip(['A', 'B', 'C'], [1, 2, 3])
for t in ts:
	print(t)